"As far as I can tell from studying the scriptures, all you do in heaven is pretty much just sit around all day and praise the Lord. I don't know about you, but I think that after the first, oh, I don't know, 50,000,000 years of that I'd start to get a little bored."

Source: Rick Riordan (2013). “Demigods and Monsters: Your Favorite Authors on Rick Riordan's Percy Jackson and the Olympians Series”, p.26, BenBella Books